DIBs in Gaia DR3 RVS spectra J/A+A/683/A199 ivo://CDS.VizieR/J/A+A/683/A199 doi:10.26093/cds/vizier.36830199 CDS Zhao H. Schultheis M. Qu C. Zwitter T. 2024-11-29T20:01:13Z 2024-03-20T09:51:24Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr interstellar-medium line-intensities Diffuse interstellar bands (DIBs) are weak and broad interstellar absorption features in astronomical spectra that originate from unknown molecules. To measure DIBs in spectra of late-type stars more accurately and more efficiently, we developed a random forest model to isolate the DIB features from the stellar components. We applied this method to 780 thousand spectra collected by the Gaia Radial Velocity Spectrometer (RVS) that were published in the third data release (DR3). After subtracting the stellar components, we modeled the DIB at 8621{AA} ({lambda}8621) with a Gaussian function and the DIB around 8648{AA} ({lambda}8648) with a Lorentzian function. After quality control, we selected 7619 reliable measurements for DIB {lambda}8621. The equivalent width (EW) of DIB {lambda}8621 presented a moderate linear correlation with dust reddening, which was consistent with our previous measurements in Gaia DR3 and the newly focused product release. The rest-frame wavelength of DIB {lambda}8621 was updated as {lambda}0=8623.141+/-0.030{AA} in vacuum, corresponding to 8620.766{AA} in air, which was determined by 77 DIB measurements toward the Galactic anticenter. The mean uncertainty of the fit central wave-length of these 77 measurements is 0.256{AA}. With the peak-finding method and a coarse analysis, DIB {lambda}8621 was found to correlate better with the neutral hydrogen than with the molecular hydrogen (represented by ^12^CO J=(1-0) emission). We also obtained 179 reliable measurements of DIB {lambda}8648 in the RVS spectra of individual stars for the first time, further confirming this very broad DIB feature. Its EW and central wavelength presented a linear relation with those of DIB {lambda}8621. A rough estimation of {lambda}0 for DIB {lambda}8648 was 8646.31{AA} in vacuum, corresponding to 8643.93{AA} in air, assuming that the carriers of {lambda}8621 and {lambda}8648 are comoving. Finally, we confirmed the impact of stellar residuals on the DIB measurements in Gaia DR3, which led to a distortion of the DIB profile and a shift of the center (<~0.5{AA}), but the EW was consistent with our new measurements. With our measurements and analyses, we propose that the approach based on machine learning can be widely applied to measure DIBs in numerous spectra from spectroscopic surveys. 2024A&A...683A.199Z https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/683/A199 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/361 : Gaia Focused Product Release (Gaia FPR) (Gaia Collaboration, 2023) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/683/A199 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/683/A199 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/683/A199 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/683/A199 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/683/A199 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/683/A199 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/683/A199/table (Fit results and measurements of the two DIBs) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/683/A199/table? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/683/A199/table? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/683/A199/table? 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41423 41428 41433-41434 41436 41439 41441-41442 41446-41447 41453-41456 41458-41459 41475-41477 41479-41481 41484-41486 41492-41494 41497-41499 41508 41511-41514 41517 41524-41526 41528-41529 41536-41537 41539 41572-41573 41575 41585-41587 41602-41605 41607 41610 41612 41615-41618 41627 41634 41636-41637 41639 41641 41643 41645-41648 41650-41651 41672 41674-41675 41680-41681 41683-41685 41687-41688 41690-41693 41695 41716-41718 41721-41722 41724-41725 41728 41731-41733 41735 41744 41746-41747 41749-41751 41764-41766 41773-41775 41777 41779-41781 41783 41788 41790-41791 41805-41806 41808-41810 41813-41818 41820 41822 41824-41825 41827 41844-41845 41847 41849-41851 41855 41864 41866-41867 41872-41874 41884 41886 41888-41889 41891-41892 41897 41899 41901-41902 41904 41906 41913 41920-41921 41923-41924 41926-41928 41931 41936 41941 41998 42008 42018-42019 42022-42023 42032 42034 42038 42044 42052 42054 42057 42068 42074 42084 42094-42095 42103-42106 42109-42112 42114-42117 42119 42125-42127 42130 42134 42136 42138-42139 42156-42158 42169 42180 42228 42314 42345 42359 42388-42390 42418 42432 42444 42495 42513 42522 42654-42655 42808 42847 42856 42858 42865 42878 42888 42909-42911 42932 42934-42935 42941 42948-42949 42952-42953 42955 42958-42959 42965 42977-42981 42984-42985 42989 42991 43014 43032 43062-43063 43065 43067 43082-43083 43092 43094-43095 43101-43102 43109 43111 43113-43118 43120-43121 43141-43143 43161-43162 43164 43169 43176 43195-43196 43200-43202 43206 43208 43212-43213 43216 43264 43266 43270 43273 43278 43312 43319 43525 43660 44222 44249 44252 44267 44300 44303 44312 44317 44319 44324 44335 44342 44348 44357-44362 44367 44369 44374-44376 44384 44387-44388 44390 44392 44395-44397 44400-44401 44414 44423 44469 44492 44496 44498-44500 44505 44507 44510 44519 44528 44530 44535 44821 44864 44892 44940 45067 45070 45080 45083 45090 45096 45115 45125 45132 45166 45170 45214 45218 45623 45631 45729 45740 47246 47268 47624 47705 47893 47895 47943 47945 47950 47956 47958 47972 47985 47988 47999 48028 48043-48044 48056-48057 48066 48079 48085 48092 48098-48100 48112 48124 48153 48559 48648 48651 48673 48677-48680 48686 48690 48699 48702 48775 48779 48785 48788 48801 48862 48957 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/683/A199?format=ascii default J/A+A/683/A199/table Fit results and measurements of the two DIBs _RA.icrs Right ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) deg pos.eq.ra indexed _DE.icrs Declination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) deg pos.eq.dec indexed recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 source ID meta.id;meta.main GLON Galactic longitude (J2016) deg pos.galactic.lon GLAT Galactic latitude (J2016) deg pos.galactic.lat rmedgeo Calibrated distance from Bailer-Jones et al., 2021, Cat. I/352 kpc pos.distance float ismsnr S/N of ISM spectra stat.snr float chi2dof Chi-square over dof stat.fit.dof float CD8621 Central Depth (CD) of DIB8621 phot.flux.density;arith.ratio float e_CD8621 Lower limit of CD8621 stat.error float E_CD8621 Upper limit of CD8621 stat.error;stat.max float CW8621 Central Wavelength (CW) of DIB8621 0.1nm em.wl.central float e_CW8621 Lower limit of CW8621 0.1nm stat.error float E_CW8621 Upper limit of CW8621 0.1nm stat.error;stat.max float W8621 Gaussian width of DIB8621 0.1nm spect.line.width float e_W8621 Lower limit of w8621 0.1nm stat.error float E_W8621 Upper limit of w8621 0.1nm stat.error;stat.max float CD8648 Central Depth (CD) of DIB8621 phot.flux.density;arith.ratio float e_CD8648 Lower limit of CD8648 stat.error float E_CD8648 Upper limit of CD8648 stat.error;stat.max float CW8648 Central Wavelength (CW) of DIB8648 0.1nm em.wl.central float e_CW8648 Lower limit of CW8648 0.1nm stat.error float E_CW8648 Upper limit of CW8648 0.1nm stat.error;stat.max float W8648 Lorentzian width of DIB8648 0.1nm spect.line.width float e_W8648 Lower limit of w8648 0.1nm stat.error float E_W8648 Upper limit of w8648 0.1nm stat.error;stat.max float a1 Continuum=a1*wave+a2 stat.fit.param;spect.continuum float e_a1 [] Lower limit of a1 stat.error float E_a1 [] Upper limit of a1 stat.error;stat.max float a2 Continuum=a1*wave+a2 stat.fit.param;spect.continuum float e_a2 [] Lower limit of a2 stat.error float E_a2 [] Upper limit of a2 stat.error;stat.max float EW8621 Equivalent width of DIB8621 0.1nm spect.line.eqWidth float E_EW8621 Upper limit of EW8621 0.1nm stat.error;stat.max float e_EW8621 Lower limit of EW8621 0.1nm stat.error float EW8648 Equivalent width of DIB8648 0.1nm spect.line.eqWidth float E_EW8648 Upper limit of EW8648 0.1nm stat.error;stat.max float e_EW8648 Lower limit of EW8648 0.1nm stat.error float EW8621int Integrated EW8621 0.1nm spect.line.eqWidth float EW8648int Integrated EW8648 0.1nm spect.line.eqWidth float Rc8621 Noise level near DIB8621 instr.det.noise float Rc8648 Noise level near DIB8621 instr.det.noise float